Hi! I have a thirdparty plugin, and I added a new method under the existing function. The plugin is in my (blueprint) project directory, and definitely it does not have any solution file. After reopening the project, I do not see my new methods are there in blueprint.
-create a fresh UE C++ project
-add a Plugins folder and throw the plugin there
-remove from the plugin folder: binaries and intermediate
-from project root, remove this files:
folder .idea
folder .vs
folder binaries
folder build
folder derivedDataCache
folder intermediate
.vs config file
*.sln file
click on your *.uproject file / select Generate Visual Studio Project files
open the solution and pack
just build and replace the plugin in your original project 
Thanks a lot. Solved the problem. For the future ref, this video also might help others.
@eldany.uy , out of curiosity, won’t the command line, e.g.,
.\RunUAT.bat BuildPlugin -plugin="old_version_plug_in_location\plugin.uplugin" -package="new_version_plug_in_location
do the same job?
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